php中use关键字用法详解

// 输出 hello world
function test(){
    $word = 'world';
    $func = function($para)use($word){
        echo $para ." ".$word;
    };
    $word = 'php';
    return $func;
}
$func = test();
$func('hello');

// 输出 hello php
function test(){
    $word = 'world';
    $func = function($para)use(&$word){ // 引用传值
        echo $para ." ".$word;
    };
    $word = 'php';
    return $func;
}
$func = test();
$func('hello');